Question

假设我有两个功能：

def moveMotorToPosition(position,velocity) 
    #moves motor to a particular position
    #does not terminate until motor is at that position

和

def getMotorPosition() 
    #retrieves the motor position at any point in time

在实践中，我希望能够让电机来回摆动（通过一个调用moveMotorToPosition两次的循环;一次带有正位置，一个带负位置）

虽然'control'循环是迭代的，但是我希望一个单独的while循环通过调用getMotorPositionnd以某种频率提取数据。然后我会在这个循环上设置一个定时器，让我设置采样频率。

在LabView中（电机控制器提供一个DLL挂钩）我通过'并行'while循环来实现这一点。我之前从未做过平行和python的任何事情，也不确定哪个是最引人注目的方向。

Answer 1

让你更接近你想要的声音：

import threading

def poll_position(fobj, seconds=0.5):
    """Call once to repeatedly get statistics every N seconds."""
    position = getMotorPosition()

    # Do something with the position.
    # Could store it in a (global) variable or log it to file.
    print position
    fobj.write(position + '\n')

    # Set a timer to run this function again.
    t = threading.Timer(seconds, poll_position, args=[fobj, seconds])
    t.daemon = True
    t.start()

def control_loop(positions, velocity):
    """Repeatedly moves the motor through a list of positions at a given velocity."""
    while True:
        for position in positions:
            moveMotorToPosition(position, velocity)

if __name__ == '__main__':
    # Start the position gathering thread.
    poll_position()
    # Define `position` and `velocity` as it relates to `moveMotorToPosition()`.
    control_loop([first_position, second_position], velocity)

在python中并行循环，用于电机控制和数据采集

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